This worries me because of the implication that it might be under-running the text buffer searching for a word-ending or something... on some systems it could crash instead of stalling if that's the case.

Affects all text fields tested, is reliable (not intermittent), fields tested are the console; inventory search; blueprint string import; and locomotive color. Affects at least steam-distributed binaries on Windows 7 x64.

To reproduce, with text cursor focus in any empty text field, press control ...